PREFAB MOBILE HOUSE WITH EXPANDABLE AND FOLDABLE STRUCTURE

I. Core Structure and Technical Characteristics

• Modular expansion design

Splicing expansion: through standardized interfaces (such as bolts or snaps) to realize the combination of multiple light steel keel units, 

a single box can be expanded to a double-decker or multi-room structure, adapting to the needs of the family, office and so on.

Folding box: Adopting hydraulic rod or slide system, the volume is reduced to 1/3 of the original size after folding, 

and a complete living space is formed after unfolding (e.g. 18-25 square meters after unfolding a 20-foot container).

• Application of lightweight materials

Main frame: hot-dip galvanized light steel keel (thickness 1.2-2.0mm), both high strength and corrosion resistance (life expectancy ≥ 50 years).

Enclosure structure: outer color steel plate (thickness 0.4-0.6mm) or aluminum composite plate, inner composite calcium silicate plate, 

filled with rock wool (density ≥80kg/m³) to achieve thermal insulation.

II. Key Functions and Performance Advantages

• Rapid construction and flexibility

The prefabrication rate of the factory reaches 90%, and only assembly is required on site, shortening the construction cycle of 200㎡ house to 2-3 months.

Adaptable to complex terrain (e.g. mountains, wetlands), fixed by ground bolts or counterweight blocks, no need to dig deep foundations.

• Disaster Resistance and Durability

Seismic resistance up to grade 9, wind resistance grade ≥12, suitable for seismic zone or coastal typhoon area.

The joints are sealed with EPDM rubber + polyurethane waterproof adhesive to prevent water seepage and cold bridge effect.

III. Typical Application Scenarios and Costs

• Application Direction

Temporary residence: construction site dormitory, post-disaster emergency room, supporting batch deployment and rapid disassembly.

Cultural tourism and commerce: scenic B&B, mobile cafe, enhancing landscape interactivity through glass curtain wall or folding doors and windows.

• Price range

Basic model (single box, including water and electricity interface): ¥500-1100/㎡.

High-end customized model (integrated smart home, photovoltaic system): ¥3000-5000/㎡.

IV. maintenance and compliance requirements

Regular maintenance: hinges and slides are lubricated quarterly, and anti-rust coating is replenished every 2 years in coastal areas.

Fire code: fireproof coating needs to reach A1 level, the width of the escape channel ≥ 0.8 meters, the circuit needs to be protected by flame retardant pipes.

Comparative analysis of lightweight steel keel and wood keel in mobile homes:

Light steel keel: suitable for long-term use, high-risk environment of the mobile house, the advantages of high strength, low maintenance, high security.

Wooden keel: suitable for short-term, complex shape of the light mobile homes, need to strictly control the environmental humidity and maintenance frequency.

I. Material characteristics and performance

• Light steel keel

Material: continuous hot-dip galvanized steel plate cold-formed, thickness 1.2-2.0mm, with high strength and corrosion resistance, service life ≥ 50 years.

Fireproof and moisture-proof: the fireproof grade reaches A1, with excellent rust-proof performance, suitable for humid, salt spray and other harsh environments.

• Wooden keel

Material: 

Processed from pine, fir, etc., plasticity, easy to bend to make complex shapes.

Environmental protection and defects: Natural wood is better for environmental protection, but it is easy to be deformed by moisture and insect, 

so it needs to be painted regularly with fireproof coating and anti-insect treatment.

II. Structural Performance and Applicable Scenarios

• Light steel keel

Seismic and wind resistance: Seismic performance is up to grade 9, wind resistance grade ≥12, suitable for high-risk scenarios such as earthquake zones and coastal typhoon zones.

Application Scenario: Workwear, temporary dormitory, emergency room in disaster area and other movable houses that need long-term stability.

• Wooden keel

Flexibility and limitations: fast construction speed, suitable for small area half-hanging modeling or curved surface design, but poor durability, need to avoid high humidity environment.

Applicable scenarios: short-term cultural and tourism lodging, temporary exhibition halls and other projects with high requirements for modeling but short use cycles.

III. Construction and maintenance cost

• Light steel keel

Difficulty of construction: professional tools and installation techniques are required, and the construction cycle is long, but the precision is high and the structure is solid.

Maintenance cost: basically no maintenance, coastal areas are recommended to check the anti-rust coating every 2 years.

• Wooden keel

Convenience of construction: flexible in cutting and splicing, suitable for quick installation, but requires regular moisture-proof and insect-proof treatment.

Comprehensive cost: low initial material cost (about ¥80-150/㎡), but higher maintenance cost, and weaker long-term cost performance than light steel keel.

IV. Compliance and safety

Fire standards: light steel keel is naturally fireproof and meets the A1 level fireproofing requirements for movable houses; wooden keel requires additional fireproof coating and is a fire hazard.

Structural safety: light steel keel is not easy to crack at the joints and has stable seismic performance; wooden keel is easy to be deformed by moisture, which may cause structural loosening.

Why Choose Us

Shijiazhuang Eiffel Steel Structure Co., Ltd.

Shijiazhuang Eiffel Steel Structure Co., Ltd. is an enterprise dedicated to researching and developing new energy-saving and environmentally friendly houses and construction methods. We always adhere to the values of honesty and quality first, and position ourselves as a leader in high-quality steel structure villa construction. We combine emerging foreign technologies with the actual domestic market and provide customers with one-stop services for prefabricated buildings such as design, production, interior decoration, and whole house customization. The prefabricated buildings produced by the company are widely used in office buildings, villas, rural courtyards, estate clubs, tourist attractions, homestays, hotels, public facilities, etc. 

At present, the company is centered in Shijiazhuang, Hebei Province, with products radiating to regions such as Beijing, Tianjin, Hebei, Shanxi, Shandong, Henan, Liaoning, Mongolia, Jiangsu, Sichuan, and Guangxi, and exported to overseas markets. Adhering to the quality demand of "building a century old villa, choose Eiffel", we strive to create an excellent brand of prefabricated buildings.

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